Azo dye for wool.



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HUGO GELDERMANN, OF GRDSS-LICHTERFELDE-QEYI, NEAR BER-LIN, GERMANY, AS-

SIGNOR TO ACTIEN GESELLSCHAFT Fill? ANILEN FABEIKATION, OF BERLIN, GER- MANY.

A30 FOR W001i.

emme,

Ho Drawing.

To all whom it may concern:

Be it known that I, HUGO GELDERMANN, a subject of the Emperor of Germany, residing at Gross-Lichterfelde-0st, near Berlin, Germany, and my post-office address being Grabenstrasse 12, Gross-Lichterfelde- 0st, near Berlin, Germany, have invented certain new and useful Improvements in A20 Dye for Wool, of which the following is a specification.

My invention relates to the manufacture of new azo dyes which are especially adapted for dyeing wool in combination with chrome niordants and may be obtained by combining diazotized Q-aminophenol derivatives containing negative substituents with Q-naphthol-sulfonic acid. The dyes thus manufactured produce on wool in combination with a suitable chrome-niordant black tints of a good fastiness.

The follow/in examples serves to illustrate my invention, the parts being by weight: 18.9 parts of 6-nitrol-chloro2- aniinophenol are diazotized in known manner by means of 30 parts of hydrochloric acid of 20 es. specific gravity and 7 parts of sodium nitrite and the diazo compound thus obtained is allowed to run while stirring into an aqueous solution of 23 parts of Q-naphthol-et-sulfonic acid and 30 parts of calcined sodium carbonate. The combination being finished the dye is precipitated by the addition of common salt, drained and dried. It is thus obtained when pulverized in the shape of a dark powder, which may be dyed on wool from a dye-hath containing sodium chromate in connection with ammonium sulfate, thus producing bluish black shades.

The new dye. as above obtained dissolves in water to a violetsolution, which on the addition of an alkali assumes a more reddish color, whereas by the addition of sulfuric acid thered colored free acid of the dye is formed; in concentrated sulfuric acid it dis solves to a violet solution; when heated with sta-nnous chlorid and hydrochloric acid the dye is decomposedyielding Qddiamino-- chlorophenol besides l-amino-2 naphtholesulfonic acid.

Specification of Letters Eetent.

Patented nee. 12, rear.

Application filed April 1, 1911.. Serial No. 618,359.

1. As new articles of manufacture thehereinbefore-described new azo dyes derived from diazotizod Q-aminophenol compounds containing negative substituents and Q-naphthol-d-sulfonic acid, these new dyes producing on wool from a dye-bath containin a neutral alkali chromate in connection wit an ammonium salt, generally speaking, black shades, which new dyes in the shape of their sodium salts when pulverized are dark powders soluble in water to blue to violet solutions, which on the addition 0f an alkali assume a more reddish color, whereas by the addition of sulfuric acid the red colored free acids of the dyes are formed, which dyes dissolve in concentrated sulfuric acid to violet solutions, and which dyes are decomposed When heated with stannous chlorid and hydrochloric acid yielding 2-aminophenol compounds besides l amino- Q-naphthol-l-sulfonic acid.

2. As a new article of manufacture the hereinbefore-described new azo dye derived from phenol and Q-naphthol-d-sulfonic acid, this new dye producing on wool from a dye-bath containing a neutral alkali chroma'te in connection with an ammonium salt, generally speaking, blaclrshades, which new dye in the shape of its sodium salt when pulverized is a dark powder, soluble in Water to a violet solution, which on the addition of an alkali assumes a more reddish color, whereas by the addition of sulfuric acid the red colored diazotized 6-nitro--chloro-Q-amino-' flfee acid of the dye is formed, which dye In testimony whereof I have hereunto set dissolves in concentrated sulfuric acid to a my hand in presence of two subscribing Witviolct solution, and which dye is decomposed nesses.

when heated with stannous chlorid and hy- HUGO GELDERMANN. 5 drochloric acid yielding- 2.6-diamino-4- Witnesses:

chlorophenol besides l-amino-Q-naphthol-- HENRY HAsPER,

sulfonic acid. WOLDEMAR HAUPT. 

